﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace MicroTest
{

        class TransparentTabControl : TabControl
        {
            private List<Panel> pages = new List<Panel>();

            public void MakeTransparent()
            {
                if (TabCount == 0) throw new InvalidOperationException();
                var height = GetTabRect(0).Bottom;
                // Move controls to panels
                for (int tab = 0; tab < TabCount; ++tab)
                {
                    var page = new Panel
                    {
                        Left = this.Left,
                        Top = this.Top + height,
                        Width = this.Width,
                        Height = this.Height - height,
                        BackColor = Color.Transparent,
                        Visible = tab == this.SelectedIndex
                    };
                    for (int ix = TabPages[tab].Controls.Count - 1; ix >= 0; --ix)
                    {
                        TabPages[tab].Controls[ix].Parent = page;
                    }
                    pages.Add(page);
                    this.Parent.Controls.Add(page);
                }
                this.Height = height /* + 1 */;
            }

            protected override void OnSelectedIndexChanged(EventArgs e)
            {
                base.OnSelectedIndexChanged(e);
                for (int tab = 0; tab < pages.Count; ++tab)
                {
                    pages[tab].Visible = tab == SelectedIndex;
                }
            }

            protected override void Dispose(bool disposing)
            {
                if (disposing) foreach (var page in pages) page.Dispose();
                base.Dispose(disposing);
            }
        }
    }

